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WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049, CPU#0: syz.3.8419/5046
Modules linked in:
CPU: 0 UID: 0 PID: 5046 Comm: syz.3.8419 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 c0 62 c2 9a e8 b0 3c 85 00 b8 01 00 00 00 87 05 d5 c3 1e 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 74 ee 88 90 48 81 fd 80 46 3d 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000007df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a39ee0
RDX: fffffbfff3584c58 RSI: 0000000000000004 RDI: ffffffff9ac262c0
RBP: ffffffff8e3d4680 R08: 0000000000000001 R09: fffffbfff3584c58
R10: 0000000000000003 R11: ffff88807698aff0 R12: 1ffffffff1c02250
R13: 0000000000000246 R14: ffffffff8e3d4680 R15: ffff8880b843bc52
FS: 00007fe7368a96c0(0000) GS:ffff8881248f4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2601e3 CR3: 0000000033950000 CR4: 00000000003526f0
Call Trace:
rcu_check_gp_start_stall kernel/rcu/tree_stall.h:1012 [inline]
rcu_core+0x4cf/0x15f0 kernel/rcu/tree.c:2852
handle_softirqs+0x219/0x950 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xdfd/0x15e0 kernel/smp.c:877
Code: 57 48 8b 54 24 10 4c 89 74 24 10 49 89 d5 48 89 d5 48 89 54 24 18 49 c1 ed 03 83 e5 07 4d 01 e5 83 c5 03 e8 45 5f 0c 00 f3 90 <41> 0f b6 45 00 40 38 c5 7c 08 84 c0 0f 85 b6 05 00 00 8b 43 08 31
RSP: 0018:ffffc90003507a08 EFLAGS: 00000246
RAX: 0000000000080000 RBX: ffff8880b8540cc0 RCX: ffffc9001375f000
RDX: 0000000000080000 RSI: ffffffff81b29c8b RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88807698aff0 R12: dffffc0000000000
R13: ffffed10170a8199 R14: 0000000000000001 R15: 0000000000000001
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline]
smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2921
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
jump_label_update+0x376/0x550 kernel/jump_label.c:919
static_key_slow_inc_cpuslocked kernel/jump_label.c:168 [inline]
static_key_slow_inc_cpuslocked+0x86/0x150 kernel/jump_label.c:151
static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:191
io_uring_create io_uring/io_uring.c:3599 [inline]
io_uring_setup+0x17dd/0x2010 io_uring/io_uring.c:3723
__do_sys_io_uring_setup io_uring/io_uring.c:3757 [inline]
__se_sys_io_uring_setup io_uring/io_uring.c:3748 [inline]
__x64_sys_io_uring_setup+0xc2/0x170 io_uring/io_uring.c:3748
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe73598f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe7368a9038 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 00007fe735be6180 RCX: 00007fe73598f749
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000003e5a
RBP: 00007fe735a13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe735be6218 R14: 00007fe735be6180 R15: 00007fff85812dd8
----------------
Code disassembly (best guess):
0: 57 push %rdi
1: 48 8b 54 24 10 mov 0x10(%rsp),%rdx
6: 4c 89 74 24 10 mov %r14,0x10(%rsp)
b: 49 89 d5 mov %rdx,%r13
e: 48 89 d5 mov %rdx,%rbp
11: 48 89 54 24 18 mov %rdx,0x18(%rsp)
16: 49 c1 ed 03 shr $0x3,%r13
1a: 83 e5 07 and $0x7,%ebp
1d: 4d 01 e5 add %r12,%r13
20: 83 c5 03 add $0x3,%ebp
23: e8 45 5f 0c 00 call 0xc5f6d
28: f3 90 pause
* 2a: 41 0f b6 45 00 movzbl 0x0(%r13),%eax <-- trapping instruction
2f: 40 38 c5 cmp %al,%bpl
32: 7c 08 jl 0x3c
34: 84 c0 test %al,%al
36: 0f 85 b6 05 00 00 jne 0x5f2
3c: 8b 43 08 mov 0x8(%rbx),%eax
3f: 31 .byte 0x31